EP1460160B1 - Machine à coudre - Google Patents

Machine à coudre Download PDF

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Publication number
EP1460160B1
EP1460160B1 EP04005374A EP04005374A EP1460160B1 EP 1460160 B1 EP1460160 B1 EP 1460160B1 EP 04005374 A EP04005374 A EP 04005374A EP 04005374 A EP04005374 A EP 04005374A EP 1460160 B1 EP1460160 B1 EP 1460160B1
Authority
EP
European Patent Office
Prior art keywords
thread
sewing machine
sewing
tightening
speed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04005374A
Other languages
German (de)
English (en)
Other versions
EP1460160A1 (fr
Inventor
Sevki Dr. Hosagasi
Horst Seibert
Arthur Picker
Johann Enns
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerkopp Adler AG
Original Assignee
Duerkopp Adler AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Duerkopp Adler AG filed Critical Duerkopp Adler AG
Publication of EP1460160A1 publication Critical patent/EP1460160A1/fr
Application granted granted Critical
Publication of EP1460160B1 publication Critical patent/EP1460160B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B51/00—Applications of needle-thread guards; Thread-break detectors
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D05B47/04—Automatically-controlled tensioning devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B47/00—Needle-thread tensioning devices; Applications of tensometers
    • D05B47/06—Applications of tensometers

Definitions

  • the invention relates to a sewing machine for stitching together at least two pieces of fabric by means of an upper thread fed to the workpieces in an upper thread running direction and a lower thread to form a knot of upper thread and lower thread according to the preamble of claim 1.
  • a sewing machine is known in which, with regard to a predetermined sewing section, the most accurate tracking of the thread tension is to take place.
  • a transducer is designed such that the corresponding thread acts directly on an independent of the thread-tensioning device actuator of the transducer.
  • An evaluation and control device is designed such that it is within a predetermined Nähabitess for each of the Sewing machine detected the maximum occurring thread tension and stores these values in a corresponding memory. From these maximum values of the thread tension, a characteristic value is determined with the aid of a statistical analysis method and compared with a predefined setpoint value.
  • a manipulated variable for controlling the thread tensioning device is determined and the setting of the thread tensioning device is changed accordingly. It is therefore not from stitch to stitch a target-actual-value comparison between each measured thread tension and the setpoint, but it will first be measured for several stitches the corresponding thread tension values from which then using a statistical analysis method calculates a characteristic value and this characteristic the predetermined setpoint is compared.
  • Working with the loop-guided thread tensioning device requires almost constant sewing conditions; During sewing operations with strongly fluctuating sewing conditions, the controller is exposed to too many disturbing variables, so that fluctuations in the sewing quality are to be expected.
  • the thread-tensioning device operates at an independent of the speed, ie the operating speed of the sewing machine thread tension, so that changes in the stitch quality can be noticeable at strongly changing speeds.
  • the invention is based on the object, a sewing machine of the generic type in such a way that the quality of the producible seams is improved.
  • the thread tensioning device can be operated in a control mode or in a control mode.
  • a control mode is selected, for example, when the actual sewing conditions are frequent, e.g. B. every two to three stitches, change. Such sewing conditions would expose the controller to a plethora of disturbances, so that favorable guidance of the thread tension force would not be possible.
  • the control mode is selected when the actual sewing conditions are almost unchanged over longer seam distances. Due to the curves stored in the microprocessor, it is achieved that the thread tensioning force parameters can each be stored as a program and recalled depending on the sewing operation.
  • the embodiment according to claim 2 leads to a user-friendly design, since it allows comfortable working.
  • the only one turn-push-button can be rotated without rotation limitation in a clockwise or counterclockwise direction and additionally pressed axially against a spring force. Turning sets values that are saved by pressing the button. For example, this can be set and called up the number of a thread tension program, an operating mode, namely a control mode or a control mode, a thread tensioning force associated with a low speed, the thread tensioning force associated with a higher speed and a thread tension characteristic increasing value.
  • the in Fig. 1 shown Näharbeitsplatz has a configured in its basic structure in a conventional manner sewing machine 1, which is arranged on a frame 2 only indicated.
  • the sewing machine 1 has in the usual way a lower part 3, a so-called base plate, an upper part 4, a so-called arm, and a lower part 3 and the upper part 4 connecting stand 5, so that it has the overall shape of a C.
  • an arm shaft 6 is rotatably mounted, by means of which a needle bar 7 with a needle 8 up and out is driven. Of the arm shaft 6 is mounted in the lower part 3, the needle 8 associated gripper 9 is driven.
  • a presser foot 10 is arranged in the upper part 4 .
  • the upper side 11 of the lower part 3 is flush with a frame 2 belonging to the support plate 12th
  • the arm shaft 6 and thus the entire sewing machine 1 is driven by means of a mounted in the frame 2 drive motor 13 via a belt drive 14.
  • a motor control 15 mounted on the drive motor 13 is provided, for the actuation of which an operator-actuatable, only indicated operating switch 16 is provided.
  • On the sewing machine 1 is further coupled to the arm shaft 6 position encoder 17 attached, which is connected via a line 18 to a control unit 19, which in turn is connected via a line 20 to the controller 15.
  • the operating part 19 and the motor controller 15 together form a sewing machine control device.
  • the position encoder 17 are via the line 18 at predetermined angular intervals, the rotational position of the arm shaft 6 representing signals to the controller 15. Usual are 512 signals per revolution of the arm shaft 6. From these signals, inter alia, the speed of the arm shaft 6 and the respective position the needle 8 are derived.
  • a first fabric part 24 and a second fabric part 25, sewn together wherein formed in the double-lockstitch sewing machine 1 between the upper thread 23 and a designated in practice as a looper thread lower thread 26 by means of the gripper 9, a node 27 is, if possible, in the joint area 28 of the fabric parts 24, 25, so in the middle of the sewn together sewing material 24, 25, should lie so that it is not visible from any side, as in Fig. 6 is shown.
  • the sewing machine 1 described so far is generally known as an industrial sewing machine and millions of times in practice in use.
  • the sewing head 21 is an in Fig. 2 and 3 Thread tensioner 29 shown in detail attached.
  • This has a means of screws 30 on the sewing head 21 mounted support plate 31.
  • a thread-tensioning device 32 is mounted, which has an electric magnet 34 provided with a magnetic coil 33 formed by a wire winding, which is arranged on the rear side of the support plate 31 in a matching recess 35 of the sewing head 21 , Centrally within the coil 33, a bolt 36 is slidably disposed, on which a electro-magnet 34 substantially covering, serving as a magnet armature disc 37 of ferromagnetic material, usually iron, is fixedly arranged, which of the electric magnet 34th is attracted when the coil 33 is traversed by current.
  • the force with which the disc 37 is tightened depends on the magnitude of the current flowing through the coil 33.
  • the bolt 36 passes through the support plate 31.
  • At its front 38 of the support plate 31 facing the end of a clamping plate 39 is fixed by means of a self-locking nut 40.
  • the clamping plate 39 can move with the bolt 36 and the disk 37 mounted on it in the longitudinal direction of the bolt 36; but it is secured by means of a pin 41 against rotation.
  • the displaceable clamping disk 39 is associated with a fixed on the front side 38 of the support plate 31, stationary clamping disk 42. Between the clamping discs 39, 42, a gap 43 for receiving the upper thread 23 is arranged.
  • the clamping discs 39 and 42 thus form two cooperating pressure elements or thread tensioning elements.
  • a loop-shaped thread guide 45th and designed as a bolt thread guide 46 is provided on the support plate 31 - based on the upper thread running direction 44 - in front of the thread tensioning device 32.
  • a thread guide 45th and designed as a bolt thread guide 46 is provided in the direction 44 behind the device 32 in the direction 44 behind the device 32.
  • the thread guide 46 similarly designed thread guide 47 is arranged.
  • the upper thread 23 is guided by the thread supply, not shown, through the thread guide 45 and the thread guide 46 to the device 32.
  • the upper thread 23 is guided through the gap 43 above the bolt 36 and then to the yarn guide 47. From there, it is guided back to the device 32, specifically below the bolt 36, through the gap 43.
  • the displaceable tensioning disk 39 thus presses the upper thread 23 on both sides of the bolt 36 against the stationary tensioning disk 42, so that no tilting of the bolt 36 can occur.
  • the upper thread 23 is guided over a conventional compensating spring 48 to the thread lever 22.
  • the compensating spring 48 serves to compensate for the small inaccuracies in the guidance of the upper thread 23 via the thread lever 22.
  • a control device 49 for the thread tensioning device 32 is further attached.
  • This has on the one hand a one-button operating unit 50 and a display unit 51.
  • the operating unit 50 has a rotary-pressure knob 52 which is infinitely rotatable in both directions of rotation. It is coupled to a rotary pulse generator 53, which in the usual way has a light barrier 54 with a slot disk 55 arranged inside it.
  • the rotation of the knob 52 causes pulses to be output, and in the usual way, each slot of the slot disc 55 will trigger a signal as it passes through the light barrier 54.
  • the pulses are forwarded via a line 56 to a microprocessor 57.
  • the rotary-pressure button 52 is further connected to a push-button switch 58, which is closed at a depression of the knob 52 in the direction of the support plate 31 and thereby gives a signal via a line 59 to the microprocessor 57.
  • the depression of the button 52 takes place against a pressure spring 60.
  • the display unit 51 has five display panels 61 to 65.
  • the display field 61 marked with # digitally displays a 2-digit, ie from 00 to 99, adjustable sewing program number.
  • the display field 62 labeled M indicates the operating mode, ie the control or regulation mode, in 1-digit fashion.
  • the designated F1 display panel 63 indicates a n1 associated thread tension force 2-digit.
  • the display field 64 denoted by F2 also indicates a two-digit speed associated with a rotational speed n2 yarn tension.
  • the display field 65 denoted by F> indicates in 2 digits a characteristic increase value, that is to say a value by which an increase of the F value can be made in case of thickening of the workpiece parts 24, 25.
  • the display unit 51 is connected via a line 66 to the microprocessor 57.
  • a thread clamping force measuring device 67 is further provided, the structure of the Fig. 2 and 4 evident.
  • This measuring device 67 has a fixed to the support plate 31 foot part 68, in which a flexible bending wire 69 on one side, so cantilever-like, is clamped.
  • a permanent magnet 70 is mounted, which acts on a Hall sensor 71.
  • the upper thread 23 is guided by two thread guides 72, 73, which are the bending wire 69 upstream or downstream.
  • the upper thread 23 is guided around the bending wire 69, wherein it is clearly deflected from its straight course between the thread guides 72, 73, such as Fig. 4 is removable.
  • the memory 77 having a microprocessor 57 via the line 18 and an input 78, the output at equal angular intervals angular momentum of the position sensor 17 is supplied.
  • Via a further input 79 the position or reference signal is supplied.
  • Via a further input 80 a switching command is supplied to the microprocessor 57 as soon as the sewing machine 1 is driven by the drive motor 13.
  • Via an input 81 the microprocessor 57 is given a switching command, for example via a knee-operated switch 82 actuated by the operator.
  • Via further input 83 a signal for a thread trimming process is supplied.
  • the microprocessor 57 is followed by a pulse width modulator 84, which in turn is connected via an amplifier 85 to the magnetic coil 33 of the electric magnet 34.
  • the magnetic coil 33 is guided via a measuring resistor 86 to ground 87. Furthermore, it is guided to a current regulator 88, which in turn is fed back to the amplifier 85.
  • the working method is as follows:
  • the digital display fields 61 to 65 light up, with first the first display field 61, ie the 2-digit display of the display of a program number # display panel is displayed with an underscore serving as a cursor 89.
  • This cursor 89 indicates which digit can be influenced.
  • the desired digit located above the cursor 89 is increased by turning the rotary-push-button 52 clockwise or lowered in the counterclockwise direction.
  • the rotary pushbutton 52 is depressed, thereby giving, via the tactile switch 58, a pulse which, on the one hand, defines the mentioned digit stored in the memory 77 and, on the other hand, the cursor 89 among the jumps to the next possible digit.
  • the 1-digit number of the program number can now be selected. After appropriate selection of this point by turning the knob 52, this in turn is determined by pressing the button 52. This selects and sets the sewing program; the cursor 89 jumps into the second display field 62. Now the display field 62 is activated for the operating mode M, wherein by turning the knob 52 either by a control mode 1 or by a control mode 2 is selected.
  • a Lemvorgang is as follows:
  • a Lemvorgang is executed in the control mode.
  • several test seams are sewn, each having a sufficient number of stitches, z. B. more than ten stitches, must have.
  • the maximum value of the necessary thread tension force which has been measured in a stitch cycle by the thread tension measuring device 67 - as described below - is further utilized .
  • the voltage profile output by the thread tension measuring device 67 becomes a desired value for the regulator formed by this measuring device 67, the amplifier 75, the analog-to-digital converter 76, the microprocessor 57 and the thread tensioning device 32 determined.
  • a pressure on the button 52 of the last determined such desired value of the voltage curve for the controller and the set current value for the thread tensioning device 32 is stored in the memory 77. This completes the learning phase for the adjustment of a value for the thread tensioning force F1.
  • a second learning phase for the thread tension F2 for a speed n ⁇ n2, for example, for a speed n2 2000 min.- 1 , is carried out in the same way, again for this purpose an empirical value for F2 is set and then sewing on numerous test seams with the increased speed F2 is detected for such a speed, in turn, a setpoint for the controller is determined from the voltage curve. With a pressure on the button 52, the last determined setpoint value for the controller and the set current value for the controller are taken over and stored. This also completes the adjustment of the value F2.
  • the thread tension force values F are extrapolated linearly. Between n1 and n2, this results in a straight line with increasing speed, which can be sloping, rising or horizontal. Below n1 and above n2, the thread tension force values are kept constant.
  • the thread tension force is constantly determined by the thread tension measuring device 67 and reported to the microprocessor 57 and compared there with the stored value, which in turn - if necessary - a readjustment takes place.
  • the control mode as the operating mode is caused that the other control variables F1, F2 and F> are placed in a non-variable, ie equally frozen state, so are not changeable.
  • thread-tensioning device 32 may also be a thread-tensioning device after the DE 41 41 945 C1 (Corr. U.S. Patent 5,363,786 ) are used, in which the upper thread is guided over a wheel which is braked by means of an electric magnet.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Inorganic Insulating Materials (AREA)
  • Massaging Devices (AREA)

Claims (5)

  1. Machine à coudre (1) pour coudre ensemble au moins deux parties de produit à coudre (24, 25) à l'aide d'un fil supérieur (23) amené aux parties de produit à coudre (24, 25) dans un sens de marche du fil supérieur (44) et d'un fil inférieur (26) en formant un noeud (27) de fil supérieur (23) et de fil inférieur (26),
    - avec un arbre de bras (6),
    - avec un moteur d'entraînement (13) entraînant l'arbre de bras (6) à une vitesse de rotation variable (n),
    - avec un dispositif de commande de machine à coudre (15),
    - avec une barre à aiguille (7) pouvant être entraînée par l'arbre de bras (6) dotée d'une aiguille (8).
    - avec un système de tension de fil (29),
    -- qui présente un dispositif de tension de fil (32) se trouvant en contact avec le fil supérieur (23) et
    -- qui génère à l'aide d'un électroaimant (34) parcouru par un courant, une force de tension de fil (F) dans le fil supérieur (23),
    --- le courant étant modifié en fonction de la vitesse de rotation (n) de l'arbre de bras (6) selon une courbe déterminée de la force de tension de fil (F) sur la vitesse de rotation (n) de telle manière que le noeud (27) de fil supérieur (23) et de fil inférieur (26) se trouve essentiellement entre les parties de produit à coudre (24, 25) et
    - avec un dispositif de commande (49) pour le dispositif de tension de fil (32),
    caractérisée en ce que
    - le dispositif de tension de fil (32) peut être utilisé au choix en mode de commande ou en mode de régulation,
    - un microprocesseur (57) avec une mémoire (77) étant prévu, dans lequel des courbes de la force de tension de fil (F) sur la vitesse de rotation (n) peuvent être enregistrées et rappelées selon l'opération de couture,
    - le dispositif de tension de fil (32) présentant un dispositif de mesure de force de tension de fil (67) qui est relié au microprocesseur (57) pour la transmission d'une force de tension de fil déterminée (F).
  2. Machine à coudre (1) selon la revendication 1, caractérisée en ce
    qu'une unité de commande à bouton unique (50) est prévue pour le mode de régulation et le mode de commande .
  3. Machine à coudre (1) selon la revendication 2, caractérisée en ce
    que l'unité de commande à bouton unique (50) présente un bouton « tourner-pousser » (52) pour l'actionnement manuel par rotation d'un générateur d'impulsions rotatif et pour l'actionnement par pression d'un commutateur (58).
  4. Machine à coudre (1) selon l'une quelconque des revendications 1 à 3, caractérisée en ce
    que le dispositif de commande (49) présente une unité d'affichage (51) avec plusieurs champs d'affichage (61 à 65) pour l'affichage d'une caractérisation de programme (#), d'un mode de fonctionnement (M) et au moins de deux valeurs de force de tension de fil (F1, F2) associées respectivement à une vitesse de rotation (n1, n2).
  5. Machine à coudre (1) selon la revendication 4, caractérisée en ce
    que l'unité d'affichage (51) présente un autre champ d'affichage (65) pour une valeur d'augmentation de la force de tension de fil (F>).
EP04005374A 2003-03-21 2004-03-06 Machine à coudre Expired - Lifetime EP1460160B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10312602A DE10312602A1 (de) 2003-03-21 2003-03-21 Nähmaschine
DE10312602 2003-03-21

Publications (2)

Publication Number Publication Date
EP1460160A1 EP1460160A1 (fr) 2004-09-22
EP1460160B1 true EP1460160B1 (fr) 2010-10-06

Family

ID=32798015

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04005374A Expired - Lifetime EP1460160B1 (fr) 2003-03-21 2004-03-06 Machine à coudre

Country Status (7)

Country Link
EP (1) EP1460160B1 (fr)
JP (1) JP2004283582A (fr)
KR (1) KR20040083367A (fr)
CN (1) CN1532322A (fr)
AT (1) ATE483840T1 (fr)
DE (2) DE10312602A1 (fr)
TW (1) TW200422464A (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5408949B2 (ja) * 2008-10-03 2014-02-05 Ｊｕｋｉ株式会社 ミシン
WO2012014610A1 (fr) * 2010-07-28 2012-02-02 エヌエスディ株式会社 Machine à coudre
DE202012011059U1 (de) * 2012-11-19 2014-02-20 Dürkopp Adler AG Nähmaschine
CH709666A1 (de) * 2014-05-16 2015-11-30 Bernina Int Ag Vorrichtung und Verfahren zum Beeinflussen der Lage von Knoten zwischen Oberfaden und Unterfaden beim Nähen mit einer Nähmaschine.
TWI625440B (zh) * 2017-01-26 2018-06-01 Zeng Hsing Industrial Co Ltd Sewing machine with free seam function
CN107354610B (zh) * 2017-09-11 2023-07-25 广东溢达纺织有限公司 电子线夹装置及车缝机构
CN110205753B (zh) * 2018-02-28 2022-02-08 兄弟工业株式会社 缝纫机和线张力检测装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6185985A (ja) * 1984-10-03 1986-05-01 蛇の目ミシン工業株式会社 ミシンの自動糸調子設定方法及び自動糸調子ミシン
DE3839733C2 (de) * 1988-11-24 1993-12-09 Pfaff Ag G M Stichbildende Maschine mit einem Meßwertaufnehmer
DE3843373A1 (de) * 1988-12-23 1990-06-28 Kochs Adler Ag Fadenspannvorrichtung fuer eine naehmaschine
DE19921516C2 (de) * 1999-05-10 2001-12-06 G M Pfaff Ag I I Näh- oder Stickmaschine
DE10113945C1 (de) * 2001-03-22 2002-06-13 Duerkopp Adler Ag Verfahren zum Zusammennähen von mindestens zwei Nähgutteilen und Nähmaschine zur Durchführung des Verfahrens

Also Published As

Publication number Publication date
KR20040083367A (ko) 2004-10-01
EP1460160A1 (fr) 2004-09-22
CN1532322A (zh) 2004-09-29
JP2004283582A (ja) 2004-10-14
DE10312602A1 (de) 2004-09-30
DE502004011715D1 (de) 2010-11-18
ATE483840T1 (de) 2010-10-15
TW200422464A (en) 2004-11-01

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